2011-09-13 17:44:24 +00:00
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<title>DB->set_feedback()</title>
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<link rel="start" href="index.html" title="Berkeley DB C API Reference" />
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<link rel="up" href="db.html" title="Chapter 2. The DB Handle" />
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<link rel="prev" href="dbset_errpfx.html" title="DB->set_errpfx()" />
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<link rel="next" href="dbset_flags.html" title="DB->set_flags()" />
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<div xmlns="" class="navheader">
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<div class="libver">
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<p>Library Version 11.2.5.2</p>
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<table width="100%" summary="Navigation header">
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<tr>
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<th colspan="3" align="center">DB->set_feedback()</th>
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</tr>
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<tr>
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<td width="20%" align="left"><a accesskey="p" href="dbset_errpfx.html">Prev</a> </td>
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<th width="60%" align="center">Chapter 2.
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The DB Handle
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</th>
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<td width="20%" align="right"> <a accesskey="n" href="dbset_flags.html">Next</a></td>
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</tr>
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</table>
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<hr />
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</div>
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<div class="sect1" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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<h2 class="title" style="clear: both"><a id="dbset_feedback"></a>DB->set_feedback()</h2>
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</div>
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</div>
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</div>
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<pre class="programlisting">#include <db.h>
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int
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DB->set_feedback(DB *,
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void (*db_feedback_fcn)(DB *dbp, int opcode, int percent)); </pre>
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<p>
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Some operations performed by the Berkeley DB library can take non-trivial amounts of time.
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The <code class="methodname">DB->set_feedback()</code> method can be used by applications to
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monitor progress within these operations. When an operation is likely to take a long time,
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Berkeley DB will call the specified callback function with progress information.
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</p>
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<p>
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It is up to the callback function to display this information in an
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appropriate manner.
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</p>
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<p>
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The <code class="methodname">DB->set_feedback()</code> method may be called at any time during the
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life of the application.
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</p>
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<p>
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The <code class="methodname">DB->set_feedback()</code> method returns a non-zero error value on
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failure and 0 on success.
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</p>
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<div class="note" style="margin-left: 0.5in; margin-right: 0.5in;">
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<h3 class="title">Note</h3>
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<p>
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Berkeley DB is not re-entrant. Callback functions should not attempt to make
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library calls (for example, to release locks or close open handles). Re-entering
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Berkeley DB is not guaranteed to work correctly, and the results are undefined.
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</p>
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</div>
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<div class="sect2" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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2011-12-20 00:07:10 +00:00
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<h3 class="title"><a id="id3687981"></a>Parameters</h3>
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2011-09-13 17:44:24 +00:00
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</div>
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</div>
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</div>
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<div class="sect3" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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2011-12-20 00:07:10 +00:00
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<h4 class="title"><a id="id3687318"></a>db_feedback_fcn</h4>
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2011-09-13 17:44:24 +00:00
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</div>
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</div>
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</div>
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<p>
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The <span class="bold"><strong>db_feedback_fcn</strong></span> parameter is the
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application-specified feedback function called to report Berkeley DB
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operation progress. The callback function must take three parameters:
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</p>
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<div class="itemizedlist">
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<ul type="disc">
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<li>
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<p>
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<code class="literal">dbp</code>
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</p>
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<p>
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The <span class="bold"><strong>dbp</strong></span> parameter is a reference to
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the enclosing database.
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</p>
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</li>
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<li>
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<p>
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<code class="literal">opcode</code>
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</p>
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<p>
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The <span class="bold"><strong>opcode</strong></span> parameter is an operation
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code. The <span class="bold"><strong>opcode</strong></span> parameter may take
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on any of the following values:
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</p>
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<div class="itemizedlist">
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<ul type="circle">
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<li>
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<p><a id="set_feedback_DB_UPGRADE"></a>
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<code class="literal">DB_UPGRADE</code>
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</p>
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<p>
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The underlying database is being upgraded.
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</p>
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</li>
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<li>
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<p><a id="set_feedback_DB_VERIFY"></a>
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<code class="literal">DB_VERIFY</code>
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</p>
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<p>
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The underlying database is being verified.
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</p>
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</li>
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</ul>
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</div>
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</li>
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<li>
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<p>
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<code class="literal">percent</code>
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</p>
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<p>
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The <span class="bold"><strong>percent</strong></span> parameter is the percent
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of the operation that has been completed, specified as an integer
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value between 0 and 100.
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</p>
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</li>
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</ul>
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</div>
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</div>
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</div>
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<div class="sect2" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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2011-12-20 00:07:10 +00:00
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<h3 class="title"><a id="id3688669"></a>Class</h3>
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2011-09-13 17:44:24 +00:00
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</div>
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</div>
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</div>
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<p>
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<a class="link" href="db.html" title="Chapter 2. The DB Handle">DB</a>
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</p>
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</div>
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<div class="sect2" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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2011-12-20 00:07:10 +00:00
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<h3 class="title"><a id="id3688262"></a>See Also</h3>
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2011-09-13 17:44:24 +00:00
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</div>
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</div>
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</div>
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<p>
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<a class="xref" href="db.html#dblist" title="Database and Related Methods">Database and Related Methods</a>
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</p>
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<a accesskey="u" href="db.html">Up</a>
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<td width="40%" align="right"> <a accesskey="n" href="dbset_flags.html">Next</a></td>
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<td width="40%" align="left" valign="top">DB->set_errpfx() </td>
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<a accesskey="h" href="index.html">Home</a>
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<td width="40%" align="right" valign="top"> DB->set_flags()</td>
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